Dental polishing cup



@m w, 1948. Q A, @HOTT 2,451,918l

DENTAL PoLIsHING CUP Filed April 6, 1944 fave/fior Patented Oct. 19, 1948 UNITED s-'Tn'l'les N PATENT 2,451,918 :CUP

Y George A. Chott, Riverside, I ll., assigner of-` nnehalf .to Hugo` J. Chott, Riverside,lll.V

,Application April s, 1944,lseriai Nqr-529,796'

mm. (ol. 3ra-5 9) This invention relatesto dental tools or instruments and method of making or producing the same, and more particularly-tol what is known as a dental polishing cup which embodies a shank having one end adapted to fit the handpiece of the dentists instrument or engine,'and the other end of which carries a rubber cup adapted to be dipped into and hold a `quantity of dentrice or tooth powder and which is held against the teeth, especially While driven `or rotated at high Acentral bore in one end thereof and splitting the tubular portion thus produced to form tongues, some of which were bent back, usually alternate ones, to form an anchoring means for the elastic or soft rubber cup which was mounted and compressed in a crude state about said end and shaped so as to form a cavityor cup in the end remote from the body thereof and then vulcanized at the proper temperature and for the required time 'necessary to leave the rubber soft and elastic, so as toconform to the teeth, cavities and interstices.

However, the molding Iof the soft rubber cup directly onto oneend ofthe polished metal' of the shanlgeven though held `by' the 'embedded tongues, failed to produce a firm connection vsuicient to Yprevent the cup from lbecoming loose during use, owing to thev centrifugal-force resulting from the high' speedlatwhich the instrument A is rotated and unevempressure appliedto different portions of the cup.

Moreover, `When'zthe vcrude rubber was formed, molded and compressed around the shank and then subjected to heat'in the 'vulcanizing process, a portion of the rubber -Would ow vclownV over the shank disposed therebeneath in a bore v`provided for the shank .in a vulcanizing mold, and form a thin sheath of rubber around the shank between the same and themold; while, owing `to thenecessityl of accurate `iii-.101 the shank and the `snugfitting vthereof in the socket, clamp'or bitstock of the handpiece, it was necessary to remove this surplus rubber vulcanized around the f vulcanization, remains harder shank before use and removal thereof sometimes s. 2 resultedein' flooseningfof `the 'cup at the base soastorenderthe'same useless.v Itis; therefore, an:l object `of `the present invention tonovercomewthe above objections and Adilculties byrso` mounting and securing the cup to t-he'rshank` in: thevvulcanizingv processthat thezrcupz Will r`be lirmly `and positively fastened or securely: anchoredi-n` position While being used and lhe1d,:even while cleansing and polishingthe .teetlLlA4 furtherwobject vofthe invention 'is to provide a device of :theohara'cter stated which shall be of such construction that the ow of surplusrubber, fusedbyvtheheat of vulcanizetiongdown'rover'rthe shank will be effectively prevented :and `gri-einrrvalIftherecn1 rendered unneces# Sary. l l f `=Othe1 objectsiv will :appear hereinafter.

`With-theselobjectsin view,my invention consists generallyinnovelrmeans for anchoringa. soft` rubber dental -lcupltol its shank, said means comprising spring ofyghardermaterial` than the Cup `armlo-tted :snugly overthe shank `adjacent ,one endfthereof;` means on `the shank` engaging said ,ringto preventfexpansion of thesame, and the 4cup vii'ulcanizeditothe ring. andi-adjacent 1 portionofmthewshaank; sodzhat the fabutting areas of` the,ring and-cuprare ffused together during vulcanization. j AMy inventlonrfurther consists` ina idevice as above-mentioued;y in which the ring, Aafter `the than the cup, so asrto ,cooperatefwith-the-tongues to prevent expension or. stretching. i `:More f specifically, `mywimrention contemplates having oertainwofmthe `tongues 4bent over and engaging the-outerrperiphery `of the ring.V

fimzention further consists iny having the ring above-mentioned, 1 arranged on the `shank in such` a'` position as `to prevent the :rubber `during vulcanizationffrom rscoping'into-the space bef tweenfthe .shankA and the wallofthe 'boreof the mold. l l

.Myfinventionfwill Ibe moregreadily understood by 4reference 1 to Athe accompanying z, drawings,-` in which-H@ Fig. ibis =a.:side:fe1evation instrument tion. f ,.lilig. 2. is .fan enlarged central flongitudinaI sec tionfthereof. Fig. 3 is a similar View ofaishankiwith a collar Orfwashennthereonpriorto theformation of the eupthereover.

Fig. c4 israu` endelevation of the shankas shown ILFig. 3.` i @58115- is .eeetianarriewm a1.meldz;.showing of a `dental tool or made inI accordance with the invenpolishing cup, consists of a shank I of polished y or nickeled metal, usually of brass or bronze, or

other suitable tough malleable metal, such as German silver, having at one end thereof a groove I I by which the shank may be held in the handpiece, clamp or bitstock of a dental'instrument, such as an ordinary dental engine at one 4 izing, into a cup-shaped contact piece completely around the shank and anchoring parts. In the form shown in Figs. 2 and 5, the collar I8 will be completely covered by the base of the cup; whereend of a exible shaft which is driven at high speed, usually by means of an electric motor.

One side of the shank at the groove II has a cutaway or flattened portion I2 by which a coupling is made to the shaft to cause the shank to rotate therewith. The otherend ofthe shank is provided'with a central counterbore^l3 which forms a relatively thin tubular portion or Wall I4, which is split longitudinally at a plurality of points, as indicated at I5, vthus'forming a plurality of longitudinal tongues, alternate ones of which are bent outwardly and backwardly, as y,

indicated at I6, and the other tongues are bent outwardly in slightly divergent relation, as indivcated at I1.

A shoulder or enlargementv I8, preferably in the form of a collar,` ring or washer of partially vulcanized crude rubber, is then applied to, or slipped on, theshank against the tongues I6 'and fitted snugly within the laps formed Aby said tongues, which forms a seat to effectively'limit the displacement of the vcollar on the shank.

This may be donev by inserting the'grooved end of the shank into the aperture of the collar, and then displacing one relative to the other by means of -a suitable template or otherwise, so that the 'collar will be forced down against the tongues.

These collars or rings may be produced by cutting the same from a partially vulcanized rubber tube of the proper size and bore to fit snugly on the shank with sufficient friction to `hold the same in position when once forced against the tongues and vulcanized to firmly adhere and be if held to the shanks.

After this, the shanks are held 'in a suitable mold body I9, having bores 2U for receiving the same and associated matrix-forming cavities 2l at the top, into which the split end of the Shanks, f

that is, the tongues and collar, project.

4The collar may be spaced from the end 22 of the cavity, so that the crude rubber ofjthe'cup 23 may enter bore I3 andbe molded and'compressed as in the other form a face of the ring is exposed.

The mold and crude rubber are then subjected to the required heat for the necessary time dura tion to properly cure or vulcanize the same, in such a manner as to leave the same elastic and soft and pliable, but tough, compression of the crude rubber in the mold serving to give the required density to the rubber to stand up in use.

The partially cured or vulcanized rubber of the collar and the crude or unvulcanized rubber of the cups as thus compressed, are then subjected to vulcanizing temperature for the required period to cause complete vulcanization necessary to leave the rubber cup elastic or soft and pliable, but tough. This causes the rubber of the collar and the cup to be fused together for a slight depth along what had been their contacting faces so that they will snugly adhere to and be firmly anchored to each other.

As the collar was initially vulcanized, it will be further vulcanized during the process and maintain a hardness somewhat greater than that of the cup, and, therefore, be firmly held by the tongues I6 and prevented from expanding from the stresses produced by the centrifugal force and the uneven pressure applied to the periphery of the cup when in use. i

l When the device is used, the cup is dipped into and holds a quantity of dentriiice or tooth powder, especially by reason of the serrated inner surface of a cup, and is held against the teeth especiallywhile driven at high speed in cleansing and polishing.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited tothe precise details of construc- .1 tion set forth, but desire to avail myself of such around, over and under the tongues and collar and around theA shank to provide a thickness of the rubber, or a wall of the same externally of and beneath the collar, as well as radially or peripherally around the same and the'tongues as illustrated in Figs. 2 and 5; or, it may bef preferv able that the collar be of such extent and so located as to abut the bottom 22 of the cavity, and prevent the melted rubber of the cup from flowing into the bores 20 during vulcanization, and adhering to the stem portion of the shank, as illustrated in Figs. 6 and '7.

The cup 23 may be provided with a flared cavity, as by forming bosses 24 on the top member 25 of the mold which is placed on a base plate 26, thus forming the raw or crude rubber combined with sulphur or other material used in vulcanvariations and modications as come within the scope of the appended claim.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: v

In a dental polishing tool. a shank having a bore at one end forming a tubular portion'split longitudinally to form tongues, certain of the tongues being bent ack on themselves in curved formation substantially normal to the axis of the shank and the other tongues bent outwardly in slightly divergent relation, a partially cured rubber collar on the shank against the firstnamed tongues with the ends of the tongues engaging the periphery of the collar, and a soft rubber cup having a body portion vulcanized over the tongues and fused with the collar to envelope the same.

GEORGE A. CHOTT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 

